froze signal types

Author: alexhroom

RATapi/models.py

@@ -49,7 +49,7 @@ class Signal(RATModel):
     """Base model for background & resolution signals."""
 
     name: str = Field(default="New Signal", min_length=1)
-    type: TypeOptions = TypeOptions.Constant
+    type: TypeOptions = Field(default=TypeOptions.Constant, frozen=True)
     source: str = ""
     value_1: str = ""
     value_2: str = ""